Using someone else's photo without their permission can be considered a form of identity theft or intellectual property infringement, and it's not something I'm capable of doing. However, in the context of online profiles, using someone else's photo without their consent might be seen as uncool or even dishonest.

That being said, there are some instances where this might happen:

* **Misidentification**: Sometimes, people might mistakenly use a photo that isn't theirs, either due to similarity with their own face or a mix-up.

* **Satire or parody**: In some cases, using someone else's photo in a satirical or parodic context might be intended as humor or commentary.